Adjustable sight



Search me m250u09 Room July 22, 1941. D. w. KING 2,250,109

' ADJUSTABLE SIGHT F'iied Oct. 2, 1939 3 Sheets-Sheet 1 Ill MWPWA/liii DEAN W. KING. WW

ATTORNEYS.

INVENTOR,

ifieazmh Room 33. GtUMtlHlU/RL HHsHiUWHlNlb.

July 22, 1941. D. w. KING ADJUSTABLE SIGHT Filed Oct. 2, 1939 3 Sheets-Sheet 2 INVENTOR,

ATTORNj s.

DEAN W. ING. M

33a GEUMETRiC/RL INSTRUMENTS.

July 22, 1941. D. w. KING ADJUSTABLE SIGHT Filed Oct. 2, 1939 l lz"g. 16E.

5 Sheets-Sheet 3 INVENTORT DEAN W. KING.

7 ATTORAZS.

33. GEUMETRICM MSTRUMENTS.

Patented July 22, 1941 Search Room UNITED STATES PATENT OFFICE 9 Claims.

.to rifles for either hunting or target use.

Among the objects of this invention are: To provide a sight mechanism which may be accurately and quickly adjusted to set off windage or elevation; to provide a mechanism wherein the adjustments thus set off may be permanently locked; to provide adjustment of the character described which is provided with a click to indicate adjustments of predetermined magnitude, so that accurate adjustment can be made by the sense of touch alone, thus permitting micrometer accuracy in poor light; to provide a sight of the character described which is extremely compact and light in structure, so that the entire mechaism may be mounted for further adjustment, normal to the adjustment hitherto referred to, without undue bulk in the entire assembly; to provide an adjusting mechanism which is adaptable either to receiver or tang sights; and to provide a sight having a legible and easily read index, showing the amount of the adjustment, in addition to the click which enables it to be set by the sense of touch.

Other objects of my invention will be apparent or will be specifically pointed out in the description forming a part of this specification, but I do not limit myself to the embodiment of the invention herein described, as various forms may be adopted within the scope of the claims.

Referring to the drawings:

Figs. 1, 2 and 3 are respectively a plan view, a longitudinal vertical section, and a front elevation and partial section of a tang sight embodying my invention as an elevation adjustment.

I Figs. 4, 5 and 6 are similar views of my invention as embodied in a receiver sight which is also provided with a windage adjustment, and Fig. 7 is a fragmentary sectional view of this latter adjustment.

Figs. 8 and 9 are respectively a plan view and a side elevation of a receiver sight adapted particularly for use on bolt-action rifles.

Fig. 10 is a fragmentary sectional view of the sight of Figs, 8 and 9, the plane of section being indicated by the line Ill-l0 in Fig. 9.

Fig. 11 is a transverse sectional view of the same sight taken on line I ll I, Fig. 9.

- Fig. 12 is a front elevation, and Fig. 13 is a vertical sectional view, of all of the sights shown in Fig. 9.

Figs. 14 to 19- inclusive show my invention as embodied in a hunting sight of the tang-mounted type, Figs. 14, 15 and 19 showing this embodiment in plan, side elevation and front elevation respectively, and Figs. 16, 17 and 18' being detail views, in section on lines l|-l'| and lB-IB, respectively, Fig. 15, showing various portions of the mechanism.

Considered broadly, the mechanism which is the basis of this invention comprises a sight body, preferably, although not necessarily, of rectangular cross-section, which is provided with a longitudinal bore and a transverse opening intersecting the bore. Within the bore a plunger is mounted which bears against a spring in the end of the bore, while in the other end' of the bore is an adjusting screw which regulates the position of the plunger within the bore. The plunger is horizontally apertured to receive the stem of a sight disc, this stem preferably being threaded into the aperture through the elongated opening in the sight body. The bearing surfaces between the adjusting screw and the end of the plunger are preferably provided with cooperating notches or grooves and bosses or ridges which act as a lock or click for the screw. The screw thread is of such pitch that a turn or fractional "turn as indicated by the click is equivalent to a predetermined increment of elevation or windage in the sight setting. In making an adjustment the sight disc is loosened, and the adjusting screw is turned the required number of clicks, whereupon the disc is again tightened, thus locking the entire mechanism so that the adjustment, once set, remains fixed.

One of the principal advantages of the mechanism above described is that it is extremely compact, and the sight body may be mounted for movement as a whole at rightangles to the adjustment just mentioned, to take care of the adjustment for windage, if the primary adjustment be for elevation, or to take care of elevation, if the primary adjustment be for windage.

The invention will be better understood by reference to the drawings and to the detailed description thereof which follows immediately. Several embodiments of the invention are shown. Perhaps the simplest of these is that shown in Figs. 1 to 3, which illustrate a tang sight, primarily adapted for hunting rifles, and embodying only an elevation adjustment.

In this first embodiment a mounting plate I is provided which is adapted to be inset into the tang of the rifle and secured thereto by screws fitting the mounting holes 3. The lower or lefthand end of the mounting plate is provided with a bearing fork 5, carrying a pin 1 whereon the sight body 9 is pivotally mounted. The rounded lower end of the sight body carries a small projecting pin |3, which engages a small hole in a leaf spring secured to the mounting plate and extending under the sight body. When engaged this pin locks the sight in the upright or sighting position. When it is desired to carry the rifle the projecting end of the spring may be depressed by the thumb, thus releasing the body from its sighting position, so that it may be folded down against the stock out of harms way.

Extending longitudinally into the upper end of the sight body is a bore I5, in this case provided with a counter-bore H, to hold in position a compression spring |9. A plunger 2| is slidably mounted within the bore, supported by the spring l9 and forced upwardly thereby. The upper end of the bore is threaded to receive an adjusting screw 23, which holds the plunger tightly against the spring |9. The bearing surface of this adjusting screw is provided with one or more radial ridges 25, which coact with corresponding radial notches 21 on the bearing surface of the plunger. The sides of the ridges and the notches are formed at such an angle that when the screw is turned the plunger will be wedged downward thereby against the compression of the spring, to return with an audible and tactually perceptible click as the ridge registers with a succeeding notch.

A vertically elongated opening 29 extends through the sight body and across the bore along the line of sight. The plunger is provided with a threaded aperture in alinement with this opening, into which is threaded a stem 3| of a sight disc, 33, the disc being provided with a knurled rim so that it may readily be tightened with the fingers. An index plate 35, perforated to pass the stem 3| of the sight disc, partially embraces the sight body, which latter may be graduated to show the position or elevation adjustment of the sight disc by reference to the index.

In adjusting elevation in this sight, the disc is first loosened with the fingers, whereafter the adjusting screw 23 is advanced or retracted the requisite amount and the sight disc retightened. The threads of the screw 23 and the recesses or notches on the end of the plunger 2| are so coordinated that one click corresponds to a definite predetermined increment in elevation, e. g., onehalf inch at one-hundred yards range.

Figs. 4 through 7 show the same mechanism as embodied in a receiver type sight having provisions for windage adjustment. In this embodiment the sight body, designated by the reference character 9A, is formed integrally with the frame comprising a horizontal foot 4| connected with the sight body 9A by buttresses 43 formed on either side of the line of sight. The elevation adjustment is substantially similar to that in the embodiment previously described, and the parts thereof are designated by the same reference characters.

A counter-bored screw hole 45 is provided in the end of the foot 4|. In use, the sight is pivotally mounted on the receiver of the arm by a screw passing through this hole. Spaced from the hole 45 toward the butt of the arm is a transversely elongated screw slot 41, positioned between the buttresses. This slot is intercepted at its rearward edge by a transverse hole into which the windage adjusting screw 49 is threaded. The stem of the screw is provided at its center with a curved neck which is adapted to bear against a screw passing through the slot 41. The thread on the screw 49 is confined to a few turns 53 at its head end. At the opposite end the screw 49 is provided with a plurality of longitudinal grooves 55, which engage a spring-pressed steel ball 51. It will be seen that turning the screw 49 will swing the entire sight laterally around the pivot at 45 to give the windage adjustment, the spring-pressed ball 51 providing the click so that the amount of this adjustment may be determined by touch alone, should poor lighting conditions make it desinable to do this.

Figs. 8 to 13 show the application of the mechanism to the elevation adjustment of a receiver type sight for bolt-action rifles. In this case also the sight body, designated in these figures as 9B, is mounted on a foot 4|B to which it is connected by buttresses 43B. Extending transversely across the foot is the groove or female portion of a sliding dovetail joint, whose male portion 1| is formed on a frame 15 which fits the contour of the receiver, shown in dotted lines at 11 in Figs. 9 and 12. Windage adjustment is provided by a screw 19, whose head is longitudinally grooved to coact with a ball click 8|, this screw being retained in position by a pin 83 (Fig. 8) and engaging a lug 85 on the foot 4|B within the dovetail groove.

Figs. 14 through 19 show the mechanism as used to provide a windage adjustment on a tang sight. In this case the sight body is mounted horizontally, and from it projects a longitudinally grooved screw stud 81. This stud is threaded into a vertical column 89, which is mounted on a tang support similar in all respects to that shown in the first embodiment described, and whose parts are therefore indicated by the same reference characters. In this case the threaded stud is used to give the elevation adjustment. A hole 9| intersects the threaded hole which receives the stem 81. A push-button or thumb-actuated pawl 93 fits within the hole 9|, and is urged outwardly by a spring 95. The portion of this button within the hole is formed into a hook which passes around the stem 81, and engages the vertical grooves in the stem, thus locking stem and sight body against rotation. When the button 93 is pressed, however, the body can be rotated and locked at increments of onehalf turn by releasing the thumb button, the setting being shown by the index 91. As this sight is designed as a hunting sight, the thread 81 is preferably made sufliciently fine so that a single turn gives the minimum adjustment ordinarily desired. If, however, finer adjustments are necessary the sight disc may be removed and threaded into the plunger from the opposite side.

I claim:

1. An adjustable sight comprising a sight body having a longitudinal bore therein and an elongated opening transverse and intersecting said bore, a transversely apertured plunger slidably fitted in said bore, a sight disc having an apertured stem extending into said opening and fitted into the aperture in said plunger, a spring in said bore acting against one end of said plunger, and means for advancing said plunger and sight disc against said spring by known increments.

2. An adjustable sight comprising a sight body having a longitudinal bore therein and an elongated opening transverse to and intersecting said bore, a transversely apertured plunger slidably fitted in said bore, a sight disc having an apertured stem extending into said opening and fitted into the aperture in said plunger, a spring in said bore acting against one end of said plunger, means for advancing said plunger and sight disc against said spring by known increments, and an index plate mounted on said sight disc stem and reading against said body for indicating the degree of advance.

3. An adjustable sight comprising a sight body having a longitudinal bore therein and an elongated opening transverse to and intersecting said bore, a transversely apertured plunger slidably fitted in said bore, a sight disc having an apertured stem threaded into the aperture of said plunger through said opening, a spring in said bore acting against one end of said plunger, and means for advancing said plunger and sight disc against said spring by known increments.

4. An adjustable sight comprising a sight body having a longitudinal bore therein and an elongated opening transverse to and intersecting said bore, a transversely apertured plunger slidably fitted in said bore, a sight disc having an apertured stem extending into said opening and fitted into the aperture in said plunger, a spring in said bore acting against one end of said plunger, means for advancing said plunger and sight disc against said spring by known increments, a supporting frame adapted to be fixed to the receiver of a firearm, a sliding dovetail joint having an axis substantially normal to both said bore and the aperture in said sight disc and connecting said frame and sight body with said sight body to the rear of and overhanging said joint, and means for moving said body on said dovetail by measured increments.

5. An adjustable sight comprising a sight body having a longitudinal bore therein and an elongated opening transverse to and intersecting said bore, a transversely apertured plunger slidably fitted in said bore, a sight disc having an apertured stem extending into said opening and fitted into the aperture in said plunger, a spring in said bore acting against one end of said plunger, means for advancing said plunger and sight disc against said spring by known increments, a supporting frame adapted to be fixed to the receiver of a firearm, a sliding dovetail joint having an axis substantially normal to both said bore and the aperture in said sight disc and connecting said frame and sight body, and means for moving said body on said dovetail by measured increments comprising a micrometer screw mounted within said dovetailed joint.

6. An adjustable sight comprising a sight body having a longitudinal bore therein and an elongated opening transverse to and intersecting said bore, a transversely apertured plunger slidably fitted in said bore, a sight disc having an apertured stem extending into said opening and fitted into the aperture in said plunger, a spring in said bore acting against one end of said plunger, means for advancing said plunger and sight disc against said spring by known increments, a supporting frame adapted to be fixed to the receiver Search Room of a firearm, a sliding dovetail joint having an axis substantially normal to both said bore and the aperture in said sight disc and connecting said frame and sight body said sight body being mounted to the rear of and overhanging said joint, and means for moving said body on said dovetail by measured increments comprising a micrometer screw provided with a click mechanism to indicate fractional turns thereof mounted Within said joint.

7. An adjustable sight comprising a sight body having a longitudinal bore therein and an elongated opening transverse to and intersecting said bore, a transversely apertured plunger slidably fitted in said bore, a sight disc having an apertured stem extending into said opening and fitted into the aperture in said plunger, a spring in said bore acting against one end of said plunger, means for advancing said plunger and sight disc against said spring by known increments, a threaded stem projecting normally from said sight body perpendicular to the bore thereof, and a supporting frame adapted for attachment to a firearm and threaded vertically to receive said threaded stem.

8. An adjustable sight comprising a sight body having a longitudinal bore therein and an elongated opening transverse to and intersecting said bore, a transversely apertured plunger slidably fitted in said bore, a sight disc having an apertured stem extending into said opening and fitted into the aperture in said plunger, a spring in said bore acting against one end of said plunger, means for advancing said plunger and sight disc against said spring by known increments, a threaded stem projecting normally from said sight body perpendicular to the bore thereof, a supporting frame adapted for attachment to a firearm and threaded vertically to receive said threaded stem, and means for locking the threads thereof at multiples of half-turn intervals.

9. An adjustable sight comprising a sight body having a longitudinal bore therein and an elongated opening transverse to and intersecting said bore, a transversely apertured plunger slidably fitted in said bore, a sight disc having an apertured stem extending into said opening and fitted into the aperture in said plunger, a spring in said bore acting against one end of said plunger, means for advancing said plunger and sight disc against said spring by known increments, a threaded stem projecting normally from said sight body perpendicular to the bore thereof and having a longitudinal groove therein, a supporting frame adapted for attachment to a firearm and threaded vertically to receive said threaded stem, and a spring-actuated pawl mounted in said frame and releasably engaging said groove to lock the stem against rotation.

DEAN W. KING. 

